GB2295355A

GB2295355A - Axially reciprocating distributor roller for the inking unit of a printing machine

Info

Publication number: GB2295355A
Application number: GB9521843A
Authority: GB
Inventors: Carsten Kelm
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 1994-11-28
Filing date: 1995-10-25
Publication date: 1996-05-29
Anticipated expiration: 2015-10-25
Also published as: GB2295355B; US5619922A; DE4442302A1; JP3025002U; DE4442302B4; GB9521843D0; FR2727351B1; FR2727351A1

Abstract

The roller (17) is rotated by gearing (4, 5) and reciprocates, together with a housing (6), relative to fixed housing parts (3, 8). A worn gear (10) on the roller rotates a crank (13) and, via a connecting rod (11), oscillates a yoke (12) about a shaft (31) held in the housing. Since a roller (17), which cooperates with guide surfaces (16) of the yoke is fixed in a direction parallel to the axis of the roller (1), the housing and roll therefore reciprocate. By adjusting the roller (17) within the surfaces (16) by means of a cylinder (22), (between stop (24) and adjustable stop (25)) the stroke of roller (1) is changed. <IMAGE>

Description

1 2295355 AN INAING UNIT FOR A PRI ING RACHIJaZ RAVING AT LE-AST ONZ

AXIALLY- RM1PROCATING DIOTRIBUTOR ROUZE The invention relates to an inking unit f or a printing machine provided with a device f or adjusting the axial stroke length during machine run of the distributor roller.

With a known device of this type (DE 25 14 414 C3) a separate drive cylinder is used to reciprocate distributor rollers, said drive cylinder axially reciprocating distributor rollers via a lever arrangement in connection with a bell-crank lever and a thrust rod. In this case, the drive cylinder is driven by a separate drive; a prerequisite being a control unit ensuring that the drive is synchronized with the machine speed. The prior-art solution includes a large number of bearings which may cause clearance especially at the point of reversal of a respective distributor roller. This may be disadvantageous to the inking of the printing plate. Furthermore, this known solution requires considerable structural efforts with regard to the drive problems, thus inevitably involving high costs. In addition, connecting several distributor rollers is not novel in printing-machine engineering.

Proceeding from this state of the art it is the object of the present invention to provide a simple and reliable solution being continuously synchronized with the machine speed and enabling an optimum machine control by means of remote control.

According to the invention this solution is achieved in that the axial stroke of the distributor roller is effected via a roller being mounted on the machine side - 2 frame, being rectangularly adjustable with respect to the longitudinal axis of the distributor roller, and being movable between two contact surfaces running parallel to each other, that said two contact surfaces are provided on a crank-type swing executing a pendulum motion about a point of rotation, and that in the range between the point of rotation of the two contact surfaces and a maximum stroke of the distributor roller the roller is adjustable via an adjusting means. This solution makes it possible to reset to zero the stroke of the distributor roller easily and quickly and to change it steplessly from standstill to a maximum position, the adjustment of the axial stroke being possible at standstill and during machine run.

An advantageous embodiment of the invention is characterized in that the point of rotation of the crank-type swing is provided on a housing mounted on the pivot of the distributor roller, that the crank-type swing is driven via a gear, preferably a worm gear, and a connecting rod so as to execute an oscillating movement, with the gear being provided in the housing. Such a drive of the crank-type swing is easy to design and of compact structure and features only few bearings with clearance. Moreover, each distributor roller may be adjusted individually.

A further advantageous embodiment of the invention is characterized in that the roller is adjustable in a guide rail rectangularly with respect to the longitudinal axis of the distributor roller, and that a pneumatic cylinder serves as an adjusting means, the adjusting path being limited by means of stops, one of said stops adjusting the stroke of the distributor roller being adjustable. According to the invention the adjustable stop is designed as a threaded spindle connected to a servomotor via a pair of spur gears. This makes it possible for the pressman to 6 3 control the distributor roller according to the respective print-specific conditions, for example, via the control console, i.e. he no longer manually has to effect an uncontrolled change in the given setting, for example, by 5 means of a handwheel.

A specimen embodiment of inking unit and adjusting means f or its distributor roller according to the invention is now described by way of example with reference to the accompanying schematic drawings, in which:Figure 1 shows the device unit with adjusting means; and Figure 2 is a side elevational view corresponding to Figure 1.

Referring to the drawings, a reciprocatable distributor roller 1 and its pivot shaft 2 are shown supported in a printing machine side frame 3 so that they can perform an axial reciprocating motion as well as a rotary motion. A drive for the distributor roller 1 is effected via a spur gear 4 meshing with a spur gear 5 of an inking unit.

At the end of the pivot shaft 2, there is mounted a housing 6 moving axially back and forth together with the distributor roller 1. Via a guide bar 7, said housing 6 is fixed against rotation. According to the stroke of the distributor roller 1, said guide bar 7 moves axially back and forth in a bearing plate 8 fastened to the machine side frame 3 via stay bolts 9. A worm gear mechanism 10 driven by the pivot shaft 2 of the distributor roller 1 is located in the housing. Said worm gear 10 drives a connecting rod 11 which, in turn, causes a crank-type swing 12 to execute an oscillating motion. Said crank- type swing 12, too, is supported in the housing so as to perform a pendulum motion.

In this case, the connecting rod 11 is mounted, with one end thereof on a pin 13, said pin being provided on the worm gear mechanism 10 so as to be eccentrically offset, whereas the other end of said connecting rod is mounted on a pivot 4 14 fastened to a swinging lever 15 which, in turn, drives the crank-type swing 12.

The crank-type swing 12 is provided with two internal contact surfaces 16 extending parallel to each other between which there is provided a roller 17 f ixed to a mounting support 18. Said mounting support 18 can be displaced on a guide rail 19 parallel to the machine side frame 3 and the bearing plate 8, respectively. The guide rail 19 is fastened to the bearing plate 8 via bolts 20. Thus, the roller 17 is mounted on the machine side frame 3 via mounting support 18, guide rail 19 and bearing plate 8.

A thrust rod 21 of an adjusting means 22 acts on the 15 mounting support 18 of the roller 17, said adjusting means being supported on the bearing plate 8 via a supporting bearing 23. said adjusting means 22 may be a pneumatic cylinder, for example, via which the roller 17 may be displaced by a distance a. The guide rail 19 has a first stop 24 against which the mounting support 18 abuts, if the centre of roller 17 coincides with the point of rotation B of the crank-type swing 12. A second adjustable stop 25 is provided on a bearing body 26 and is connected to a servomotor 30 via a pair of spur gears 28,29, said servomotor being also mounted on the bearing body 26. Via the servo motor 30, the stop 25 may be changed with respect to the maximum position shown in Figure 1, by turning the threaded spindle 27 until the centre of roller 17 coincides with the swivel point B. Similar to the servomotor 30, the adjusting means 21 may be remote-controlled, as a result of which a respective position of the roller may be steplessly changed between both end positions.

By turning the distributor roller 1, the worm gear 10 imparts onto the connecting rod 11 a reciprocating motion causing the pin 14 and the swinging lever 15 to execute a pendulum motion which, via an axle 31, is then transmitted 5 to the crank-type swing 12. Thereafter, said crank-type It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention.

LIST OF REFERENCE NUMERALS distributor roller pivot machine side frame 2 3 4 spur gear spur gear housing guide bar bearing plate stay bolt worm gear connecting rod cranktype swing 6 7 8 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 pin pin swinging lever contact surface roller mounting support guide rail bolt thrust rod adjusting means supporting bearing stop stop bearing body threaded spindle spur gear spur gear servomotor axis

Claims

7 1. An inking unit for a printing machine having at least one axially reciprocating distributor roller and means for adjusting the axial stroke length of the roller during running of the printing machine, comprising a roller which is adjustable in directions normal to the longitudinal axis of said distributor roller, and which is adapted to be mounted on a side frame of the printing machine, said roller being movable between two contact surfaces extending parallel to each other, and which are provided on a cranktype swing which executes a pendulum motion about a point of rotation, and including an adjusting means for adjusting said roller from the point of rotation of said two contact surfaces to the maximum stroke of said distributor roller.

2. An inking unit according to claim 1, wherein the point of rotation of the crank-type swing is provided on a housing mounted on a pivot of the distributor roller, the crank-type swing being driven via a gear mechanism, and a connecting rod whereby said crank-type swing executes an oscillating motion, with said gear mechanism being located in said housing.

3. An inking unit according to claim 2, wherein said gear mechanism includes a worm gear.

4. An inking unit according to any one of claims 1-3, wherein the roller is adjustable on a guide rail in directions normal to the longitudinal axis of the distributor roller, and wherein a pneumatic cylinder serves as an adjusting means, with a path of adjustment being limited by at least one stop which is adjustable for adjusting the stroke of the distributor roller.

5. An inking unit according to claim 4, wherein the adjustable stop is designed as a threaded spindle connected to a servomotor via a pair of spur gears.

8 6. An inking unit, substantially as hereinbefore described with reference to the accompanying drawings.

7. A printing machine having an inking unit as claimed in any one of claims 1-6.